The closed-door meeting came one week after Republican and Democratic senators expressed outrage that they didn't receive an intelligence briefing on The Washington Post journalist's slaying on Oct. 2.

Though President Donald Trump gave the Saudi government the benefit of the doubt, the briefed lawmakers appeared more convinced of suggestions the crown prince ordered the killing.

"You have to be willfully blind not to come to the conclusion that this was orchestrated and organized by people under the command of MBS and that he was intricately involved in the demise of Mr. Khashoggi," he added, using a nickname for Prince Mohammed.

Graham said that though Saudi Arabia is a "strategic ally," the relationship with Riyadh should not be saved "at all costs."

"I cannot see him being a reliable partner to the United States," he said of the crown prince, calling him "dangerous."

President Trump said in a statement that "our intelligence agencies continue to assess all information, but it could very well be that the Crown Prince had knowledge of this tragic event -- maybe he did and maybe he didn't!"

But the CIA said Prince Mohammed likely ordered Khashoggi's death after listening to intercepted communications from Mohammed.